ON5 Company

The fifth element: the energy efficiency

ON5 stands for the “On the 5th element of Energy” conveying the vision of its founders to promote the transition for businesses and individuals towards a world where Energy savings would improve our lives. Aiming at the 5th element of consuming no energy we would become less dependent of the existing four sources or energy which are the atom, the sun, the moon and the earth.

These four elements are indeed the sources of all the existing types of energy mastered so far by mankind (nuclear, photovoltaics, wind power, biomass, tidal energy, hydroelectricity, geothermal power and fossil fuels). The 5th Element is the cheapest, the one than does not pollute and the backbone of a successful energy efficiency approach.

ON5 is the international brand funded by the French cleanweb company called in French “Economie d’Energie” (stands for Energy Savings).


The Team

There are 100 of us working at ON5 COMPANY GROUP. We have all different background from young talented individuals to senior experienced energy professionals. We have one common passion all fully engaged personally with the company’s purpose.

We are now expanding in Europe (Italy, Spain) and now UK under the brand name ON5


Myriam Maestroni CEO


Franck Bruneau Vice-President


Christelle Spiry Sustainable Development Director


François Châtelain Marketing Director


Rosa Uriona ON5 Company Spain Director


Nicolás Diez Perez IT Director


Anne Creusy Finance Director


CÉDRIC PAQUET sales director


Pauline Richard Technical and Operations Director


Antoine Mersch Controller


DOMINIQUE RAJZBAUM Market Services Director


More than 100 people from different backgrounds


Foundation e5t



The purpose of the e5t Foundation is to become the one stop think tank that will influence operators to act upon: “Energy Efficiency, Saving energy and our local communities”

E5t is an open think-tank where everyone who is working and/or is concerned by the challenges and opportunities could share and collaborate with peers and other practitioners, researchers and business contacts.

The vision of the foundation to help identify and address the challenges we all face in relation to the decrease of stocks fossil energies and their now recognized detrimental effect on the environment. E5t foundation will contribute to generate and communicate about innovative solutions to these climate change energy dependency related issues.


1. To engage the know-how and skills of all the energy industry practitioners (enterprises, politicians, public servants, students, teachers and consumers). At our Summer Event (last over 2 days in August in La Rochelle in France), each invited speaker will be given the opportunity to present their work for 10 minutes individually or within a round-table discussion.

2. In order to promote and raise the profile and media visibility of innovative ideas and businesses in Energy Efficiency, we have created the Energy Innovation Awards for Local Communities. These Awards will incentivize the launch of new projects and initiatives that will directly or indirectly contribute to adapt to the shift to renewable energy.

Applicants need to apply via our website on www.e5t.fr and choose one of the three following categories :

·         Innovation

·         Efficiency: Implementation and tangible impact

·         Positive Impact on local communities

The 3 winners of E5t Territorial Innovation Prize for the 2016 edition were:

  1.  Navya technologies, with a fleet of 100% autonomous electrical cars.
  2.  Comwatt, the project which promote self-consumption of the electricity produced by private individuals through photovoltaic solar panels, associated with an original and innovative system that allows to use and stock energy for daily uses, thanks to optimization algorithms.
  3.  Carabati, tiles made in France which favours manufacturing techniques allowing to reduce environmental footprint.

A Special Mention Prize was awarded to Blue Planet Challenge, a program set up to allow children and young people to discover in a playful manner the notion of sustainable development through an online platform, educational kits for teachers and activities for schoolchildren.

The Jury’s Favourite Prize was for “L’arbre à vent” (Wind Tree), a wind power generator with natural and innovative design that insure its efficiency in urban areas.


  • The first summer university conference of the 5et Foundation in La Rochelle took place on the 28th and 29th of August 2013 under the title “Energy, Energy Efficiency and Local Communities.’’ With over 130 attendees and 45 scheduled talks, the event was a huge success.
  • The second conference under the title “Energy transition, Innovation and Local Communities, “on the 27th and 28th of August 2014, was an even greater success with the participation of over 230 people attending 50 talks.
  • The third conference has exceeded expectations. On the 26th and 27th of August 2015, under the title “In the run up to COP21 – are France and Europe good examples?” The event had closed to 280 participants and 60 speakers.
  • The 4th edition took place on August 24th and 25th, 2016 in La Rochelle. This last edition gathered 450 participants and 70 speakers, invited to reflect on “the low carbon growth and its paradoxes, from the Paris Agreement to the solutions of the COP22.” 

To obtain all the information: http://www.e5t.fr/




Tailored energy efficiency solutions for businesses and individuals.
More information about ON5 UK


A comprehensive program designed to incentivise and engage energy consumers at home, at work and using transports to become “eco-actors”. The program reaches out to employees, customers, suppliers, students and pupils in schools.


Digital solutions coupled with a range of operational services to help home owners renovate their property. Renovation works become simpler, clearer and affordable.


Digital solutions combined with a range of operational services designed to help any business, institution or organisation save costs and reduce their energy consumption.


Our comprehensive and flexible offering to implement successfully your energy efficiency strategy


Business Case: Bpifrance



  • To develop citizen consciousness among its employees.
  • To unit its teams, using dynamic and fun learning and commitment.
  • To promote not only environmentally friendly actions and behaviors but also social actions.


  • ON5 COMMUNITY: the web platform VOTRE GESTE AU COMPTEUR  is an innovative and fun tool designed to increase awareness of Bpifrance employees around positive actions for the planet and the environment (eco-actions) and allow them to commit toward social actions (socio-actions)
  • The platform allow Bpifrance to federate a community of committed and responsible employees, and to promote energy savings.

Business Case: BNP Paribas

home biz


  • Business committed in assisting its customers in the Energy Transition, reducing its carbon footprint and that of its customers.
  • Business looking to become more innovative and interesting in doing of Energy Efficiency a driver for competitiveness.
  • Business in need to offer new services to its clients to stay competitive and increase turnover.


  • ON5 BIZ: New digital and operational offer designed to help SMEs, clients or not of BNP PARIBAS, on line and off line, to carry out and optimize their energy efficiency projects.
  • ON5 HOME: New digital and operational offer designed to help BNP PARIBAS and HELLO BANK individuals clients, on line and off line, to carry out and optimize their renovation work projects.
  • Both offers include a complete chain of services: from EPC’s and audits, to technical solutions and funding services.

Under construction


Regulation in spain


Energy Efficiency National Fund


Alternative measures


Regulation in France


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Energy poverty


Energy passport


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Regulation in Italy


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 Directly related to the E.U Energy Efficiency Directive, the most recent Government's target is equivalent to achieving new energy savings each year from 1 January 2014 to 31 December 2020 of 1.5% of annual energy sales to final customers. The target has been set at 324 TWh.

3 policy measures have been identified to contribute towards the target: the Carbon Emissions Reduction Target (CERT); Community Energy Saving Programme (CESP) and Energy Company Obligation (CEO).

Some of the policies applied to existing energy efficiency schemes that require energy measures are listed as following:

  • Mandatory Greenhouse (GHG) reporting. From October 2013, all quoted companies are required to report and comment on their greenhouse gas emissions
  • Climate Change Agreements (CCAs) provides energy-intensive industries with tax discounts in return for meeting energy efficiency targets
  • Energy Performance Certificates. Introduced as part of the EU Energy Performance of Buildings Directive, it shows energy efficiency ratings of domestic and non-domestic buildings based on age, size and fabric of the building

The United Kingdom has developed a series of policies and schemes to promote energy efficiency. 



The Energy Company Obligation (ECO) is a government scheme that oblige larger suppliers to deliver energy efficiency measures to domestic premises in Britain.

  • Carbon Emissions Reduction Obligation

Under the Carbon Emissions Reduction Obligation, obligated suppliers must promote measures like roof and wall insulation and connections to district heating systems.


  • Carbon Saving Community Obligation

Under the Carbon Saving Community Obligation, obligated suppliers must promote insulation measures and connections to district heating systems in areas of low income. 

  • Home Heating Cost Reduction Obligation

Under the Home Heating Cost Reduction Obligation, obligated suppliers must promote measures which improve the ability of low income and vulnerable households (the ‘affordable warmth group’) to heat their homes.



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The Renewable Heat Incentive (Domestic and Non Domestic RHI) is a government financial incentive to promote the use of renewable heat. Different technologies are accepted under the scheme (Biomass only boilers, air source heat pumps, solar thermal panels...) 

The scope of the scheme is to incentivise the generation of renewable energy in small scale installations of less than 5 MW. Under the scheme small generator receive a payment for the electricity they produce, and in case they also export to the grid, for this electricity. 



  • Smart Metering Implementation Programme (read more)

Smart meters are part of the Government’s plan for upgrading the UK’s energy system. The aim of the scheme is for all homes and small businesses to have smart meters by 2020. Energy suppliers are required to carry out the installation.


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  •  Private Rented Sector Minimum Energy Efficiency Standards (from 2018) (read more)

The scheme will require landlords to secure an EPC certificate with at least an E rating in order to issue a new lease for a property from the 1st April 2018 and from April 2023 for existing leases.

  • The Assessment of Energy Performance of Non-domestic Buildings Regulation (Only in Scotland - From 2016) (read more)

Owners of Non-domestic building in Scotland will be required to assess the energy performance and the emissions of all building with a floor area or more than 1,000m2. Owner will also have to produce a plan on how improve the energy performance as well as install solution to reduce emissions of buildings.

  • ESOS - Energy Saving Opportunity Scheme (read more)

The ESOS Scheme is the UK answer to the EU Energy Efficiency Directive. According to the ESOS‟s rules each organisation, that complies with the qualify criteria, has to take an energy assessment. These assessments are audits of the energy used by their buildings, industrial processes and transport to identify cost-effective energy saving measures.

In order to qualify an organisation has to:

-           be a UK company that either: employs 250 or more people, or has an annual turnover in excess of 50 million euro, and an annual balance sheet total in excess of 43 million euro

-          an overseas company with a UK registered establishment which has 250 or more UK employees (paying income tax in the UK).

This process has to be done every four years, next deadline will bein December 2019. Companies certificated with ISO 50001 do not need to go through all the process.

The Climate Change Levy is a tax that non-domestic users, or who supply theme, have to pay on the energy they consume. Until July 2015 renewable energy was exempted, but on the 8th of July the Chancellor confirmed tax exemption for renewable energy was over. 

Climate Change Agreement is a scheme under which companies can ask for a reduction on the Climate Change Levy. For operators who hold a CCA, the CCL will be reduced by:

90% on electricity bills 

65% on other fuels 

CCAs are available for a wide range of industry sectors from major energy-intensive processes such as chemicals, paper and supermarkets to agricultural businesses such as intensive pig and poultry farming. The current CCA scheme started in April 2013 and will run until 31 March 2023. An operator that has a CCA will measure and report its energy use and carbon emissions against agreed targets over four, two-year target periods. 

It is a scheme designed to tackle emission coming from non-intense industries in the private and public sector. Companies with a consumption in excess of 6,000MWh, but that are not part of EU ETS or the CCL, have to take part to thescheme. The scheme covers around 10% of the UK carbon emissions.  



  • HEEPS Home Energy Efficiency Programme (Scotland) (read more)

The scheme was designed to tackle fuel poverty. Under HEEPS, household could get help to cut their bills and, depending on the circumstance, install energy efficiency solutions. 

The Government is testing if projects that deliver electricity savings at peak could in future compete for funding with generation, demand side response (DSR) and storage in the GB Capacity Market. 

The UK Investment Bank has been created by the UK government in 2012, its main objective is to accelerate the transition to a greener and stronger economy by investing in the creation of new and green infrastructure across the UK. Over the last years, the UK Green Investment Bank has worked with a number of organizations (like the NHS) to develop financial products that can help accelerate the development of the market.



ON5 Company


Contact UK

ON5 Company LTD, UK

Anne-France Kennedy

+44 78 10 893 029

Impact Hub King's Cross - 34b York Way, King's Cross London
More information

Contact FR

Economie d'Energie SAS, France

Aurélie Gosselin

+33 181 69 30 00

67 Boulevard Bessières, 75017 Paris

Contact ES

ON5 Company Spain SL, Spain

Raquel Herrero

+34 677 444 290

Paseo de Recoletos, 7-9 5º, 28004 Madrid

Contact IT

ON5 SRL, Italy

Giuseppe Truglio

+39 33 93 887 806

Corso Matteotti 1, 20121 Milano